337 lines
7.4 KiB
C
337 lines
7.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Sysctl 1.01 - A utility to read and manipulate the sysctl parameters
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*
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* Copyright 1999 George Staikos
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* Changelog:
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* v1.01:
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* - added -p <preload> to preload values from a file
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* v1.01.1
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* - busybox applet aware by <solar@gentoo.org>
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*
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*/
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#include "busybox.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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/*
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* Function Prototypes
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*/
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static int sysctl_read_setting(const char *setting, int output);
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static int sysctl_write_setting(const char *setting, int output);
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static int sysctl_preload_file(const char *filename, int output);
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static int sysctl_display_all(const char *path, int output, int show_table);
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/*
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* Globals...
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*/
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static const char PROC_PATH[] = "/proc/sys/";
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static const char DEFAULT_PRELOAD[] = "/etc/sysctl.conf";
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/* error messages */
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static const char ERR_UNKNOWN_PARAMETER[] = "error: Unknown parameter '%s'\n";
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static const char ERR_MALFORMED_SETTING[] = "error: Malformed setting '%s'\n";
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static const char ERR_NO_EQUALS[] =
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"error: '%s' must be of the form name=value\n";
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static const char ERR_INVALID_KEY[] = "error: '%s' is an unknown key\n";
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static const char ERR_UNKNOWN_WRITING[] =
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"error: unknown error %d setting key '%s'\n";
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static const char ERR_UNKNOWN_READING[] =
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"error: unknown error %d reading key '%s'\n";
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static const char ERR_PERMISSION_DENIED[] =
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"error: permission denied on key '%s'\n";
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static const char ERR_PRELOAD_FILE[] =
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"error: unable to open preload file '%s'\n";
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static const char WARN_BAD_LINE[] =
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"warning: %s(%d): invalid syntax, continuing...\n";
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static void dwrite_str(int fd, const char *buf)
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{
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write(fd, buf, strlen(buf));
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}
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/*
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* sysctl_main()...
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*/
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int sysctl_main(int argc, char **argv)
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{
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int retval = 0;
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int output = 1;
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int write_mode = 0;
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int switches_allowed = 1;
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if (argc < 2)
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bb_show_usage();
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argv++;
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for (; argv && *argv && **argv; argv++) {
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if (switches_allowed && **argv == '-') { /* we have a switch */
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switch ((*argv)[1]) {
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case 'n':
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output = 0;
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break;
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case 'w':
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write_mode = 1;
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switches_allowed = 0;
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break;
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case 'p':
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argv++;
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return
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sysctl_preload_file(((argv && *argv
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&& **argv) ? *argv :
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DEFAULT_PRELOAD), output);
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case 'a':
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case 'A':
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switches_allowed = 0;
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return sysctl_display_all(PROC_PATH, output,
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((*argv)[1] == 'a') ? 0 : 1);
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case 'h':
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case '?':
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bb_show_usage();
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default:
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bb_error_msg(ERR_UNKNOWN_PARAMETER, *argv);
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bb_show_usage();
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}
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} else {
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switches_allowed = 0;
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if (write_mode)
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retval = sysctl_write_setting(*argv, output);
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else
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sysctl_read_setting(*argv, output);
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}
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}
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return retval;
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} /* end sysctl_main() */
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/*
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* sysctl_preload_file
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* preload the sysctl's from a conf file
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* - we parse the file and then reform it (strip out whitespace)
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*/
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#define PRELOAD_BUF 256
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int sysctl_preload_file(const char *filename, int output)
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{
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int lineno = 0;
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char oneline[PRELOAD_BUF];
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char buffer[PRELOAD_BUF];
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char *name, *value, *ptr;
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FILE *fp = NULL;
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if (!filename || ((fp = fopen(filename, "r")) == NULL)) {
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bb_error_msg_and_die(ERR_PRELOAD_FILE, filename);
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}
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while (fgets(oneline, sizeof(oneline) - 1, fp)) {
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oneline[sizeof(oneline) - 1] = 0;
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lineno++;
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trim(oneline);
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ptr = (char *) oneline;
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if (*ptr == '#' || *ptr == ';')
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continue;
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if (strlen(ptr) < 2)
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continue;
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name = strtok(ptr, "=");
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if (!name || !*name) {
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bb_error_msg(WARN_BAD_LINE, filename, lineno);
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continue;
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}
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trim(name);
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value = strtok(NULL, "\n\r");
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if (!value || !*value) {
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bb_error_msg(WARN_BAD_LINE, filename, lineno);
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continue;
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}
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while ((*value == ' ' || *value == '\t') && *value != 0)
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value++;
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strcpy(buffer, name);
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strcat(buffer, "=");
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strcat(buffer, value);
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sysctl_write_setting(buffer, output);
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}
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fclose(fp);
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return 0;
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} /* end sysctl_preload_file() */
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/*
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* Write a single sysctl setting
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*/
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int sysctl_write_setting(const char *setting, int output)
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{
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int retval = 0;
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const char *name = setting;
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const char *value;
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const char *equals;
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char *tmpname, *outname, *cptr;
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int fd = -1;
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if (!name) /* probably dont' want to display this err */
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return 0;
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if (!(equals = strchr(setting, '='))) {
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bb_error_msg(ERR_NO_EQUALS, setting);
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return -1;
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}
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value = equals + sizeof(char); /* point to the value in name=value */
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if (!*name || !*value || name == equals) {
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bb_error_msg(ERR_MALFORMED_SETTING, setting);
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return -2;
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}
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tmpname = bb_xasprintf("%s%.*s", PROC_PATH, (int)(equals - name), name);
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outname = bb_xstrdup(tmpname + strlen(PROC_PATH));
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while ((cptr = strchr(tmpname, '.')) != NULL)
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*cptr = '/';
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while ((cptr = strchr(outname, '/')) != NULL)
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*cptr = '.';
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if ((fd = open(tmpname, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) {
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switch (errno) {
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case ENOENT:
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bb_error_msg(ERR_INVALID_KEY, outname);
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break;
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case EACCES:
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bb_perror_msg(ERR_PERMISSION_DENIED, outname);
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break;
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default:
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bb_error_msg(ERR_UNKNOWN_WRITING, errno, outname);
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break;
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}
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retval = -1;
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} else {
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dwrite_str(fd, value);
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close(fd);
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if (output) {
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dwrite_str(STDOUT_FILENO, outname);
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dwrite_str(STDOUT_FILENO, " = ");
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}
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dwrite_str(STDOUT_FILENO, value);
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dwrite_str(STDOUT_FILENO, "\n");
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}
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/* cleanup */
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free(tmpname);
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free(outname);
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return retval;
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} /* end sysctl_write_setting() */
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/*
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* Read a sysctl setting
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*
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*/
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int sysctl_read_setting(const char *setting, int output)
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{
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int retval = 0;
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char *tmpname, *outname, *cptr;
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char inbuf[1025];
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const char *name = setting;
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FILE *fp;
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if (!setting || !*setting)
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bb_error_msg(ERR_INVALID_KEY, setting);
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tmpname = concat_path_file(PROC_PATH, name);
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outname = bb_xstrdup(tmpname + strlen(PROC_PATH));
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while ((cptr = strchr(tmpname, '.')) != NULL)
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*cptr = '/';
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while ((cptr = strchr(outname, '/')) != NULL)
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*cptr = '.';
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if ((fp = fopen(tmpname, "r")) == NULL) {
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switch (errno) {
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case ENOENT:
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bb_error_msg(ERR_INVALID_KEY, outname);
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break;
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case EACCES:
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bb_error_msg(ERR_PERMISSION_DENIED, outname);
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break;
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default:
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bb_error_msg(ERR_UNKNOWN_READING, errno, outname);
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break;
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}
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retval = -1;
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} else {
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while (fgets(inbuf, sizeof(inbuf) - 1, fp)) {
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if (output) {
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dwrite_str(STDOUT_FILENO, outname);
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dwrite_str(STDOUT_FILENO, " = ");
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}
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dwrite_str(STDOUT_FILENO, inbuf);
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}
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fclose(fp);
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}
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free(tmpname);
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free(outname);
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return retval;
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} /* end sysctl_read_setting() */
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/*
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* Display all the sysctl settings
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*
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*/
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int sysctl_display_all(const char *path, int output, int show_table)
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{
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int retval = 0;
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int retval2;
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DIR *dp;
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struct dirent *de;
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char *tmpdir;
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struct stat ts;
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if (!(dp = bb_opendir(path))) {
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retval = -1;
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} else {
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while ((de = readdir(dp)) != NULL) {
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tmpdir = concat_subpath_file(path, de->d_name);
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if(tmpdir == NULL)
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continue;
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if ((retval2 = stat(tmpdir, &ts)) != 0)
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bb_perror_msg(tmpdir);
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else {
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if (S_ISDIR(ts.st_mode)) {
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sysctl_display_all(tmpdir, output, show_table);
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} else
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retval |=
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sysctl_read_setting(tmpdir + strlen(PROC_PATH),
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output);
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}
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free(tmpdir);
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} /* end while */
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closedir(dp);
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}
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return retval;
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} /* end sysctl_display_all() */
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